physics MCQs – Page 13

Practise multiple-choice questions from physics for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

physics Mcqs

241. Sum of the masses of constituent nucleons as compared to the mass of the resultant nucleus is______________?
0

A. Smaller

B. Sometimes smaller some times greater

C. Same

D. Greater than 82

242. I ^. (j^ x k^) is equal to______________?
0

A. i^

B. k^

C. j^

D. 1

243. The phase angle between the voltage and the current in an AC circuit consisting of a resistance is______________?
0

A. 90

B. Zero

C. 180

D. 45

244. The bombardment of nitrogen with alpha particles will produce______________?
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A. Neutron

B. Electron

C. Positron

D. Proton

245. Radioactive materials can be identified by measuring their_______________?
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A. Mass

B. Half life

C. Hardness

D. Density

246. An inductor may store energy in ________________?
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A. Its electric field

B. Its coils

C. Its magnetic field

D. Both electric and magnetic fields

247. Which one of the following physical quantities does not have the dimensions of force per unit area ?
0

A. Pressure

B. Youngs modulus

C. Stress

D. Strain

248. An inductive coil has a resistance of 100?. When an AC signal of frequency 1000Hz is fed to the coil the applied voltage leads the current by 45?. What is the inductance of the coil ?
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A. 12mH

B. 16mH

C. 10mH

D. 20mH

249. A certain stress applied to an elastic material produces a certain strain in it. If the elastic limit is not exceeded the energy gained per unit volume of the material is given by_________________?
0

A. (stress/strain)

B. Stress/strain

C. (Stress / strain)

D. Stress x strain

250. The relationship between Tesla and smaller unit Gauss of magnetic induction is given by_________________?
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A. 1T = 10-2 G

B. 1T = 10-4 G

C. 1T = 103 G

D. 1T = 104 G

251. When the speed of a moving body is doubled then___________________?
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A. its P.E is doubled

B. its acceleration is doubled

C. its K.E is doubled

D. its momentum is doubled

252. On the basis of band theory of solids the semiconductors have _____________________?
0

A. A partly filled valence band a totally empty conduction band and a wide forbidden band

B. A party filled valence band and totally empty conduction band

C. A completely filled valence band a totally empty conduction band and a very wide forbidden band

D. A completely filled valence band a partially filled conduction band and a narrow forbidden band

253. If east, west, north, south, up and down are representing the direction of unit vectors, then east x south has the direction along_____________?
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A. Up

B. North

C. West

D. Down

254. A magnetic compass will be deflected if it is kept near a____________________?
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A. none

B. charge at rest

C. both

D. charge in motion

255. Transuranic elements have an atomic number_______________?
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A. Greater than 72

B. Greater than 82

C. Greater than 102

D. Greater than 92

256. The effective way to increase the sensitivity of a moving coil galvanometer is to___________________?
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A. use a very long and fine suspension

B. use a very strong magnetic field

C. use a coil with very large number of turns

D. use a coil of very large area

257. SI unit of torque is______________?
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A. N.m

B. joule

C. Both a and b are correct

D. Neither a nor b is correct

258. X-rays are electromagnetic waves like________________?
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A. Microwaves

B. Light waves

C. ?-rays

D. Heat waves

259. Why gamma rays are used to kill bacteria to sterilize surgical equipment etc ?
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A. Chargeless

B. All of above

C. Massless

D. Highly penetrating

260. Strontium-90 is used as __________________?
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A. ?-particle source

B. Neutron source

C. ?-particle source

D. ?-rays source

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